02 November 2017 6 370 Report

I want to calculate surafce stress in Si (001) surface after reconstruction by using software quantum espresso. As in the output it is displaying stress matrix ..my z - component (sigma zz) of stress is not zero, but I have taken a enough vaccum , no external force acts on the surafce and therfore it should be zero .So I am not understanding why it is giving z - component (sigma zz) of stress ?

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